import constant

assert(constant.MATH_PI == 3.1416)
assert(constant.RADIUS == 2)
assert(constant.CIRCLE_AREA == 3.1416 * 2 * 2)
assert(isinstance(constant.MATH_PI, float))
assert(isinstance(constant.RADIUS, int))

value = constant.RED
assert(isinstance(value, int))

constant.set_color(constant.GREEN)
value = constant.get_color()
assert(isinstance(value, int))
assert(constant.GREEN == value)
assert(constant.GREEN == constant.cvar.my_color)
